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\(\dfrac{8}{3}-\dfrac{1}{2}-1=\dfrac{8\times2}{3\times2}-\dfrac{1\times3}{2\times3}-1=\dfrac{16}{6}-\dfrac{3}{6}-1=\dfrac{13}{6}-1=\dfrac{13}{6}-\dfrac{6}{6}=\dfrac{7}{6}\)
bn chọn đáp án A: 7/6 nhé.
ht
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\(\frac{1}{7}+\frac{2}{9}+\frac{3}{10}+\frac{7}{9}+\frac{6}{7}+\frac{7}{10}\)
\(=\left(\frac{1}{7}+\frac{6}{7}\right)+\left(\frac{2}{9}+\frac{7}{9}\right)+\left(\frac{3}{10}+\frac{7}{10}\right)\)
\(=\frac{7}{7}+\frac{9}{9}+\frac{10}{10}=1+1+1=3\)
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Bài 1
a 2/5+3/6=12/30+15/30=27/30=9/10 .
b 5/9-1/6=30/54-9/54=21/54=7/18
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\(a,\dfrac{4}{5}+\dfrac{2}{7}=\dfrac{28}{35}+\dfrac{10}{35}=\dfrac{38}{35}.\)
\(b,2-\dfrac{8}{9}=\dfrac{18}{9}-\dfrac{8}{9}=\dfrac{10}{9}.\)
\(c,\dfrac{5}{8}\times3=\dfrac{5\times3}{8}=\dfrac{15}{8}.\)
\(d,5:\dfrac{6}{21}=5\times\dfrac{21}{6}=\dfrac{5\times21}{6}=\dfrac{105}{6}=\dfrac{35}{2}.\)
\(đ,\dfrac{3}{5}\times\dfrac{4}{5}\times\dfrac{6}{7}=\dfrac{3\times4\times6}{5\times5\times7}=\dfrac{72}{175}.\)
\(a,\dfrac{4}{5}+\dfrac{2}{7}=\dfrac{28}{35}+\dfrac{10}{35}=\dfrac{38}{35}\)
\(b,2-\dfrac{8}{9}=\dfrac{18}{9}-\dfrac{8}{9}=\dfrac{10}{9}\)
\(c,\dfrac{5}{8}\times3=\dfrac{5\times3}{8\times1}=\dfrac{15}{8}\)
\(d,\dfrac{3}{5}\times\dfrac{4}{5}\times\dfrac{6}{7}=\dfrac{3\times4\times6}{5\times5\times7}=\dfrac{72}{175}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp án C
Kết quả của phép tính 3 7 × 1 2 là 3 14